Marie-Chantal travels by train to her cousin's place to spend a winter holiday, when a stranger entrusts her with false jewels that contain a virus powerful enough to destroy all humankind.

• Rome-Paris Films
• Les Productions Georges de Beauregard
• Marie Laforêt
• Francisco Rabal
• Serge Reggiani
• Charles Denner
• Stéphane Audran
• Akim Tamiroff
• Roger Hanin
• Antonio Passalia